Kate Middleton and Prince William Royal Wedding Dress Code: Female Guests Must Remember to Bring a Hat

Kate Middleton Wearing Hat Designed by, Philip Treacy

The wedding invitations were received by 1900 people who were invited to the Royal wedding on April 29, 2011.  There is one request for the guests, and that is how they should dress.. The men were asked to wear; a lounge suit, morning coat or uniform. The women could wear anything, but were asked to wear a hat during the wedding ceremony. Kate Middleton knows how to wear a hat.  She is seen here with a hat that was designed by Philip Treacy at the Passing Out ceremony parade, at Sandhurst in 2006.